Bird feeder with elastomeric feed port

ABSTRACT

An elastomeric feed port and a bird feeder having a seed reservoir with a seed opening fitted with such an elastomeric feed port is provided. The feed port has an elastomeric seed control membrane with a cutout that forms at least one aperture through which birds can access seed in the reservoir. The cutout is shaped to create flexible flaps or fingers adjacent the aperture in the membrane that partially cover the seed opening to reduce seed spillage but that can be pushed aside or temporarily deformed by a bird when the bird inserts its beak into the cutout aperture to access seed therethrough.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority under 35 U.S.C. § 119 to U.S.Provisional Patent Application No. 62/799,302, filed Jan. 31, 2019.

FIELD OF THE INVENTION

The present disclosure is related to the field of bird feeders for wildbirds and, more particularly, to an elastomeric grommet-style feed portfor reducing bird seed spillage under non-bird-feeding conditions and toa bird feeder having such ports.

BACKGROUND

Bird feeders that dispense seed typically include a seed reservoirhaving at least one feed port with an opening through which birds accessthe seed in the reservoir. To reduce the spillage of seed, many stylesof bird feeders have recessed ports from which, under average feedingconditions, most seed does not escape due to the distance the seed mustbe moved before it will fall out of the feeder. However, should thefeeder be subjected to shaking, spinning, striking, tilting, lifting orother physical displacement from a static feeder position, seed willbegin to fall out of the reservoir through the uncovered feed portopenings.

Seed waste is one of the leading causes of consumer dissatisfaction withbird feeders. It has been found that many consumers choose to stop usingbird feeders because the feeders spill seed all over the ground and, asseed for wild birds is seen as a luxury or non-essential expense, mostconsumers do not want to have it wasted, particularly in a locationwhere other feeding animals, such as squirrels, can freely access thespilled seed.

Accordingly, a need exists for a bird feeder with an improved feed porthaving an opening that is readily accessible to birds while at the sametime reducing seed spillage and waste.

SUMMARY

In view of the foregoing, the present disclosure is directed to a birdfeeder having a seed reservoir with a seed opening and an elastomericfeed port. The feed port has an elastomeric body that includes agrommet-style edge member and a center seed control membrane, preferablymolded as one piece forming a monolithic body. The seed control membraneis preferably surrounded by the edge member which fits within the seedopening in the side of the seed reservoir and secures the feed port tothe seed reservoir. As used herein, a “grommet-style” edge member isdefined as an insertable member that is mounted within the seed openingso as to be secured against the adjacent edge of the material thatdefines the seed opening, such as against the edge of the reservoir sidewall adjacent the seed opening.

The elastomeric seed control membrane has a cutout that forms at leastone aperture through which birds can access seed in the reservoir.According to a preferred embodiment, the cutout is shaped to createflexible flaps or fingers adjacent the aperture in the membrane that atleast partially cover the seed access area but that can be pushed asideor temporarily deformed by a bird when the bird inserts its beak intothe cutout aperture to access seed therethrough. When birds are notfeeding, however, the flexible flaps or fingers of the seed controlmembrane act as baffles or screening members over the seed opening toeffectively reduce seed spills as might otherwise occur when the feederis subjected to physical displacement by, among other things, generalweather effects, squirrel activity, and feeder maintenance activities,such as when the user adds seed to the feeder.

Accordingly, it is an object of the present disclosure to provide a birdfeeder having a seed reservoir with a seed opening, the seed openingbeing fitted with an elastomeric feed port that is secured within theseed opening of the reservoir and that includes an elastomeric seedcontrol membrane which at least partially covers the seed opening toreduce seed spillage during times when birds are not feeding from thefeeder.

Another object of the present disclosure is to provide a bird feederhaving an elastomeric feed port in accordance with the preceding objectin which the feed port is preferably one piece and includes agrommet-style edge member formed as an outer ring surrounding theelastomeric membrane, the membrane having a cutout that forms at leastone aperture through which birds can access seed in the reservoir.

A further object of the present disclosure is to provide a bird feederwith an elastomeric grommet-style feed port in accordance with thepreceding objects in which the cutout is shaped to create flexible flapsor fingers adjacent the aperture in the membrane, the flaps or fingerscovering at least part of the seed access area when birds are notfeeding to reduce seed spills while being flexible to allow a bird totemporarily deform or push them aside when the bird inserts its beakinto the cutout aperture to access seed therethrough.

A still further object of the present disclosure is to provide a birdfeeder with an elastomeric grommet-style feed port in accordance withthe preceding objects in which the cutout is shaped like an asterisk,having an open central region and a plurality of radially-extending armsthat define narrow open areas with the flaps or fingers being formed bythe portions of the membrane in the generally triangular areas betweenadjacent arms.

Yet another object of the present disclosure is to provide a bird feederwith a seed opening fitted with a feed port having an aperturedelastomeric membrane, the apertured elastomeric membrane allowing birdsto access seed while also functioning as a baffle to partially cover theopening and reduce seed spillage under non-bird-feeding conditions inwhich the feeder is subject to physical displacement such as shaking,spinning, striking, tilting, lifting or other physical displacement froma static feeder position.

Still another object of the present disclosure is to provide a birdfeeder with a feed port having an elastomeric membrane in accordancewith the preceding object in which the apertured membrane includes acutout shaped to form a plurality of flexible flaps or fingers adjacentopen areas of the cutout, at least the edges of the flaps or fingersbeing elastically deformable by a bird accessing seed through the cutoutwhile, in the absence of bird activity, the flaps or fingers at leastpartially cover the opening in the seed reservoir to block seed fromfalling out of the reservoir.

A further object of the present disclosure is to provide a bird feederwith a feed port in accordance with the preceding two objects in whichthe feed port includes a grommet-style edge member forming an outer ringand the cutout has an open central region and a plurality of open armsso as to be generally shaped like an asterisk, the flaps or fingersbeing formed by the portions of the membrane in the generally triangularareas between adjacent arms.

Yet another object of the present disclosure is to provide a bird feederwith a feed port in accordance with the preceding object in which thegrommet-style outer ring and the membrane are both elastomeric and arepreferably made as a single piece.

Another object of the present disclosure is to provide an elastomericfeed port for a bird feeder, the feed port including an elastomeric seedcontrol membrane that blocks seed spillage, the membrane having at leastone cutout with the edges thereof being temporarily deformable by afeeding bird to allow access to seed in the bird feeder while beingelastic to return to a seed blocking configuration when birds are notfeeding.

Yet another object of the present disclosure is to provide anelastomeric feed port for a bird feeder in accordance with the precedingobject in which the at least one cutout is an elongated slit.

Still another object of the present disclosure is to provide anelastomeric feed port for a bird feeder in accordance with the precedingtwo objects in which the elastomeric seed control membrane includes agrommet-style edge member that is mounted within an elongated opening inthe seed reservoir of the bird feeder, a center part of said elastomericseed control membrane having a plurality of cutouts formed as elongatedlinear slits.

Yet another object of the present disclosure is to provide anelastomeric feed port for a bird feeder in accordance with the precedingobject in which the elongated linear slits are substantially parallelwith one another.

Yet another object of the present disclosure is to provide anelastomeric feed port for a bird feeder in accordance with the precedingobject in which the elongated opening in the seed reservoir is generallyrectangular and the grommet-style edge member is also generallyrectangular.

These together with other objects and advantages which will becomesubsequently apparent reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming a part hereof, whereinlike numerals refer to like parts throughout.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a bird feeder including a seed reservoirwith two elastomeric feed ports having integrated perches in accordancewith the present disclosure.

FIG. 2 is a planar view of the upper feed port shown in FIG. 1 withoutthe perch installed.

FIG. 3 is a perspective view of the lower feed port shown in FIG. 1without the perch installed.

FIG. 4 is a rear perspective view of the feed port shown in FIG. 3 afterbeing removed from the seed opening in the reservoir.

FIG. 5 shows the flexibility of the elastomeric feed port shown in FIG.4, with the feed port being folded upon itself between a user's thumband forefinger.

FIGS. 6A and 6B are two isolated perspective views of an elastomericfeed port with an integrated perch in accordance with a secondembodiment of the present disclosure.

FIG. 7 is an isolated perspective view of a non-perch style elastomericfeed port in accordance with a third embodiment of the presentdisclosure.

FIG. 8 is a perspective view of a bird feeder having a seed reservoirwith a plurality of non-perch style elastomeric feed ports in accordancewith a fourth embodiment of the present disclosure.

FIG. 9 is an isolated perspective view of the one of the non-perch styleelastomeric feed ports shown in FIG. 8.

FIG. 10 is a perspective view of a bird feeder having a seed reservoirwith two different styles of elastomeric feed ports in accordance withfifth and sixth embodiments of the present disclosure.

FIG. 10A is an enlarged view of detail A of FIG. 10.

FIG. 11 is a planar view of a feed port in accordance with a seventhembodiment of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

It is to be understood that the embodiments described herein aredisclosed by way of illustration only. It is not intended that thedisclosure be limited in its scope to the details of construction andarrangement of components set forth in the following description orillustrated in the drawings. Also, in describing the preferredembodiments, specific terminology will be resorted to for the sake ofclarity. It is to be understood that each specific term includes alltechnical equivalents which operate in a similar manner to accomplish asimilar purpose.

As shown in FIG. 1, the present disclosure is directed to a bird feedergenerally designated by reference numeral 10 having a seed reservoir 12with at least one seed opening 14 (see also FIG. 4). In the examplefeeder shown in FIG. 1, two of the seed openings 14 are fitted withelastomeric feed ports, generally designated by reference numeral 16,which include an upper feed port 16 a and a lower feed port 16 b. FIG. 1also depicts a molded plastic feed port 17.

Each feed port 16 is preferably formed as one piece and includes anelastomeric outer ring 18 that surrounds an elastomeric seed controlmembrane 20. As used herein, the outer “ring” 18 is defined as theperimeter of the feed port 16 and is not limited to being circular inshape but may be oval or any polygonal shape such as rectangular,triangular, hexagonal and the like. In most cases the shape of the outerring 18 will be selected to correspond, or to be in substantialcorrespondence, with the shape of the seed opening 14 in the reservoir12. As used in connection with correspondence between the shape of theouter ring 18 and the shape of the seed opening 14, “substantial” isdefined as being similar enough in shape to functionally secure theouter ring 18 within the seed opening 14 (e.g., via a press-fit) so thatthe feed port 16 is not disengaged from the seed reservoir 12 by afeeding bird when in normal use.

The elastomeric seed control membrane 20 has a cutout generallydesignated by reference numeral 22 that forms at least one aperture 24through which birds can access seed in the reservoir 12 while theremainder of the membrane 20 covers the reservoir seed opening 14.According to the first embodiment, the cutout 22 is shaped to createflexible flaps or fingers 26 adjacent the aperture 24 in the membrane20. The flaps or fingers 26 cover part of the seed access area definedby the reservoir seed opening 14 when birds are not feeding to preventseed spills while at least the edges thereof are flexible to allow abird to temporarily deform or push them aside when the bird inserts itsbeak into the cutout aperture 24 to access seed therethrough.

In the embodiment shown in FIG. 1, the cutout 22 has a central region 30and a plurality of radially-extending arms 32, in this case six, so asto be generally shaped like an asterisk. The central region 30 and thearms 32 are open areas with the flaps or fingers 26 being formed by theportions of the elastomeric membrane 20 in the generally triangularareas between adjacent arms 32. As used herein in connection with theshape of the cutout 22, “generally” is intended to refer to an asteriskshape as well as shapes that would be recognized by the ordinaryobserver as resembling an asterisk. As used herein, “generallytriangular” is intended to refer to a shape that is triangular as wellas shapes that have rounded corners that do not meet the mathematicaldefinition of a triangle but that would be recognized by ordinarypersons as resembling a triangle.

While the general shape of the cutout 22 is the same in the upper andlower feed ports 16 a, 16 b of FIG. 1, the lower feed port 16 b has alarger open area as defined by the width of the arms 32 and the diameterof the central region 30. The feed port 16 b could therefore beeffectively used with larger seeds while the feed port 16 a is able toprevent spillage of smaller seeds. The cutouts 22 may be made with agreater or lesser number of the arms 32, as few as two and preferably nomore than ten, and in different sizes. However, according to a preferredembodiment the arms 32 have a width of between 0.125″ and 0.1875″, andpreferably about 0.15″; and a length of between about 0.5″ and about 1″,and preferably about 0.85″. The central region 30 is between about 0.2″and about 0.4″ in diameter, as determined according to the type of seedbeing restricted. In this regard, the central region 30 does not have tobe circular. As used herein in connection with the size ranges of thecutout, “about” is intended to refer to the stated value plus or minus0.1″.

A closer view of the upper elastomeric feed port 16 a is provided inFIG. 2. Similarly, a closer view of the lower elastomeric feed port 16 bis shown in FIG. 3. In each case, a perch mount 40 is formed integrallywith the outer ring 18 of the feed port 16, with the perch mount 40including an opening 42 through which a perch 44 (see FIG. 1) may beinserted and secured to the side of the seed reservoir 12. As shown inFIG. 4, the reservoir 12 has a corresponding perch opening 46 adjacentthe seed opening 14 to accommodate such a perch mount.

Still referring to FIG. 4, the rear side 48 of the outer ring 18 (seeFIGS. 2 and 3) includes an axially-extending flexible flange 50 that isinserted through the seed opening 14 to secure the feed port 16 therein.The flexible flange 50 may include at least one annular groove formedtherein (see FIG. 6A, for example) for engaging with walls of the seedopening 14. A flexible annular rim 52 projects rearwardly from the perchopening 42 and is inserted through the perch opening 46 in the reservoir12 to stabilize the perch mount 40. As shown in FIG. 5, the feed port 16is flexible and has elastic memory to return to its original shape oncemounted to the reservoir 12.

In accordance with the present disclosure, a second embodiment of anelastomeric feed port generally designated by reference numeral 160 isshown in FIGS. 6A and 6B. The elastomeric feed port 160 includes a perch144 that is formed integrally with the feed port and thus is alsoelastomeric. The flange 50, the seed control membrane 20 and the cutout22 are like that of the first embodiment. The rearwardly projecting rim52 shown in FIG. 4, however, is not necessary with the integral perch144 of FIGS. 6A and 6B.

A third embodiment of an elastomeric feed port 260 in accordance withthe present disclosure is shown in FIG. 7. The feed port 260 is likethat of the first embodiment, having a generally circular elastomericouter ring 218, a flexible flange 250, and an elastomeric seed controlmembrane 220 with a cutout 222, but does not include a perch mount.

A bird feeder 100 having a plurality of elastomeric feed ports 360 inaccordance with a fourth embodiment of the present disclosure is shownin FIG. 8. FIG. 9 is an enlarged view of the feed port 360. The feedport 360 includes an elastomeric outer ring 318 that surrounds anelastomeric seed control membrane 320 having a cutout 322 as in thethird embodiment but, rather than being round, the outer ring 318 andmembrane 320 are generally square. The feed port 360 also includes aflexible flange 350 that is inserted through one of the seed openings inthe feeder reservoir 312 (see FIG. 8) to secure the feed port 360therein.

A bird feeder 200 having two types of elastomeric feed ports generallydesignated by reference numerals 460 and 560 in accordance with fifthand sixth embodiments of the present disclosure, respectively, is shownin FIG. 10. FIG. 10A is an enlarged view of detail A of FIG. 10.

According to the fifth embodiment, the feed port 460 is analogous to thefeed port 160 of the third embodiment, having a circular elastomericouter ring 418 surrounding an elastomeric seed control membrane 420, andwith a flexible flange 450 on a rear side thereof to the secure the feedport 460 to the feeder reservoir 412. However, the cutout 422 isembodied as a plurality of elongated slits that are preferably generallyparallel with one another. The slits are about 0.06″ in opening heightto be suitable for dispensing thistle seed. The number and length of theslits may vary but it is preferred that the slits are generally betweenabout 0.5″ and about 0.75″ in length and number at least two having aspacing from one another of about 0.25″.

In addition, while the slits as shown are horizontally oriented,alternatively the slits may be vertically oriented or angled or may haveanother pattern. The slits may also be grouped in at least one of agroup of horizontally aligned slits, a group of vertically aligned slitsand a group of angularly aligned slits, with each group being part of aseparate feed port such that a single feeder may have a plurality ofports, each having a different or the same slit orientation. In theembodiment shown in which the feed port is generally circular, thedifferent orientations may be achieved by rotating the feed port withinthe opening in the reservoir side wall. As used in connection with theslits, “generally parallel” means having a relationship that theordinary person would recognize as being parallel in nature even if notparallel with mathematical precision.

According to the sixth embodiment, a feed port 560 includes an elongatedelastomeric outer ring 518 having a longitudinal axis that runssubstantially parallel with the longitudinal axis of the feederreservoir 412 as shown in FIG. 10. An elastomeric seed control membrane520 is provided with a plurality of cutouts 522 formed as linear slitsthat extend transverse to the longitudinal axis. The slits may beoriented horizontally (as shown) or may be angled while still having agenerally parallel relationship with one another.

The feed port 560 also includes one or more perch mounts 540 formedintegrally therewith. Each perch mount 540 includes an opening 542through which a perch 544 is inserted and secured to the side of thefeeder reservoir 412. As best seen in FIG. 10A, the reservoir 412 has acorresponding perch opening 546 to accommodate the perch 544. By havinga large number of slits, i.e., on the order of at least 6 to about 15,feeding from the feeder 200 is made easy for birds of a variety ofheights as they alight on the perches 544.

Referring generally to FIG. 11, a feed port according to a seventhembodiment of the present disclosure may include a pattern of slits orcuts 54 formed through a control membrane thereof, as distinct from theopenings or cutouts described in accordance with other embodimentsherein. In this way, edges of adjacent fingers or flaps defined by thesecuts may remain substantially in contact with one another in a restingor unbiased state of the feed port, creating a closed or generallyclosed membrane covering the seed opening. Openings through the membranemay be created or realized only as, for example, a bird inserts its beakinto the membrane, deforming the flaps. In other embodiments, a feedport may include the same slits or cuts 54, as well as at least acentral opening or cutout (e.g., central region 30 as shown in FIG. 1).Still referring to FIG. 11, a feed port according to any of theembodiments of the present disclosure may include one or morereinforcing ribs, such as reinforcing rib 56, integrally molded to runalong a center line of one or more of the triangular flaps to ensurethat the flaps, while being displaceable, also retain sufficientelasticity to return to a seed blocking configuration when birds are notfeeding.

In each of the foregoing embodiments, the elastomeric feed port ispreferably made of a thermoplastic elastomer (TPE) having a mediumdurometer, such as TPE 49 Shore A. The feed ports may alternatively bemade of silicone or any other elastomeric material. With a feed portmade of TPE 49 Shore A, the elastomeric seed control membrane ispreferably about 0.08″ thick. This thickness may be uniform across theseed control membrane, or the edges of the cutout may be made thinner tofacilitate displacement by a feeding bird.

The present disclosure is also directed to a feed port having anelastomeric seed control membrane constructed as described above toblock seed spillage that can be fitted within seed openings of variousbird feeder reservoirs. The elastomeric seed control membrane has acutout with the edges thereof being temporarily deformable by a feedingbird to allow access to seed in the bird feeder while being elastic toreturn to a seed blocking configuration when birds are not feeding.However, the outer ring used with the elastomeric seed control membranemay be made of a hard plastic material like that of the feed port 17shown in FIG. 1, with the elastomeric seed control membrane beingsecured within the port 17 using an inner flange like flanges 50, 250,350, or other securing element(s).

While disclosed herein as a grommet-style feed port, the elastomericseed control membrane described herein can be incorporated within birdfeeder ports having other reservoir mounting configurations. The presentdisclosure is thus intended to include any bird feeder port having anapertured elastomeric screening membrane that controls an outflow ofseed as might occur due to physical displacement of the feeder while theedges of the screening membrane aperture can be temporarily deformed bya bird to enable the bird to access seed in the feeder seed reservoirthrough the aperture.

The foregoing descriptions and drawings should be considered asillustrative only of the principles of the disclosure. The embodimentsmay be configured in a variety of shapes and sizes and is not limited bythe dimensions of the preferred embodiment. Numerous applications of thepresent disclosure will readily occur to those skilled in the art.Therefore, it is not desired to limit the disclosure to the specificexamples disclosed or the exact construction and operation shown anddescribed. Rather, all suitable modifications and equivalents may beresorted to, falling within the scope of the disclosure.

What is claimed is:
 1. A bird feeder comprising: a seed reservoir havingat least one seed opening defining a seed access area; and a feed portfitted over the at least one seed opening, the feed port including anelastomeric seed control membrane at least partially covering the seedaccess area for preventing seed from spilling out of the reservoir andan outer ring surrounding the seed control membrane, the seed controlmembrane oriented generally parallel to an exterior surface of the seedreservoir defining the at least one seed opening and recessed withrespect to an exterior facing surface of the outer ring, the membraneincluding at least one cutout and being deformable in at least one areathereof such that seed in the reservoir may be selectively accessedthrough the membrane.
 2. The bird feeder of claim 1, wherein the cutoutdefines an aperture in the membrane, and wherein the cutout is furthershaped to define flexible flaps or fingers adjacent the aperture.
 3. Thebird feeder of claim 2, wherein the cutout has a central region and aplurality of radially-extending arms defining the flexible flaps orfingers, the radially-extending arms forming gaps separating adjacentones of the flexible flaps or fingers from one another in an undeformedstate of the seed control membrane.
 4. The bird feeder of claim 3,wherein the flaps or fingers are formed by generally triangular areas ofthe membrane defined between pairs of adjacent radially-extending arms.5. The bird feeder of claim 1, wherein the cutout includes a pluralityof generally parallel, linear slits.
 6. The bird feeder of claim 1,wherein the feed port comprises an elastic, monolithic body.
 7. The birdfeeder of claim 1, wherein the feed port includes at least one flexibleflange extending in an axial direction of the feed port, the flangeengaging with the seed opening for securing the feed port therein. 8.The bird feeder of claim 1, wherein the seed reservoir has a first perchopening aligned with a second perch opening formed in the feed port. 9.The bird feeder of claim 8, wherein the feed port defines an annular rimextending into the first perch opening of the seed reservoir.
 10. Thebird feeder of claim 1, wherein an elongated portion of the outer ringextends in a direction away from a remainder of the feed port andopposes the exterior surface of the seed reservoir, the elongatedportion defining at least one of a perch opening or a perch formedintegrally with the elongated portion.
 11. The bird feeder of claim 10,wherein the seed reservoir has a first perch opening aligned with asecond perch opening formed in the elongated portion of the outer ring,the elongated portion of the outer ring defining an annular rim engagingwith the first perch opening.
 12. The bird feeder of claim 11, furthercomprising a perch received through the first and second perch openings.13. The bird feeder of claim 1, wherein feed port includes a first feedport and a second feed port arranged on opposite sides of the seedreservoir, each of the first and second feed ports including a seedcontrol membrane defining a perch opening, the feeder further comprisinga shared perch extending through the perch opening of the first feedport, the seed reservoir and the perch opening of the second feed port.14. A feed port for a bird feeder comprising: an elastomeric seedcontrol membrane for blocking seed spillage in a seed blockingconfiguration, the elastomeric seed control membrane having a cutoutwith edges that are temporarily deformable from the seed blockingconfiguration to provide selective access to seed in the bird feederwhile being elastically returnable to the seed blocking configuration,the cutout including a plurality of generally parallel, linear slits;and an outer ring surrounding the elastomeric seed control membrane. 15.The feed port of claim 14, wherein the outer ring is elongated with alongitudinal axis generally parallel with a longitudinal axis of anassociated bird feeder reservoir, the plurality of generally parallel,linear slits being transverse to the longitudinal axis.
 16. The feedport of claim 14, wherein the slits are grouped in at least one of agroup of horizontally aligned slits, a group of vertically aligned slitsand a group of angularly aligned slits.
 17. The feed port of claim 14,further comprising a perch opening formed through the seed controlmembrane.
 18. A feed port for a bird feeder comprising: an elastomericseed control membrane for blocking seed spillage in a seed blockingconfiguration, the elastomeric seed control membrane having a cutoutwith edges that are temporarily deformable from the seed blockingconfiguration to provide selective access to seed in the bird feederwhile being elastically returnable to the seed blocking configuration,the cutout including an aperture in the membrane having an open centralregion and a plurality of radially-extending arms defining flexibleflaps or fingers, the radially-extending arms forming gaps separatingadjacent ones of the flexible flaps from one another in an undeformedstate of the seed control membrane; and an outer ring surrounding theelastomeric seed control membrane.
 19. The feed port of claim 18,wherein the elastic seed control membrane is recessed with respect to anexterior facing surface of the outer ring.
 20. The feed port of claim18, further comprising a perch opening formed through outer ring, theouter ring defining a protruding annular rim coaxially aligned with theperch opening.